Korn Shell Script - Getting yesterdays date


 
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# 8  
Old 11-13-2003
Another method could be to run a script at midnight via cron

0 0 * * */path/to/script.sh
Code:
mv /path/to/today.txt /path/to/yesterday.txt
date '+%Y%m%d' > /path/to/tovay.txt

So whenever a script wants to have yesterday's date, you get it from the file
Code:
yest=$(</path/to/yesterday.txt)

# 9  
Old 11-13-2003
Quote:
Originally posted by frustrated1
# ./datecalc -a 2003 11 12 - 1 | read y m d ; echo ${y}${m}${d}
y: Undefined variable


any ideas?
In your first post you specified ksh. That is why I posted ksh code. It will not work with other shells. Switch to ksh and try it again.
# 10  
Old 07-30-2007
Computer

Please try this out.
./datecalc -a 2003 11 12 - 1
let the o/p is 2003 11 11
so
dt=2003 11 11
echo $dt | tr -d [[:blank:]]

Smilie
# 11  
Old 07-30-2007
If you are happy for the new (yesterday) date in a variable then try

Code:
$> YESTERDAY=`TZ=aaa24 date +%Y%m%d`
$> echo $YESTERDAY
20070729
$>

# 12  
Old 07-30-2007
1) Are we sure this will work on the first of the month as well?
2) I am also needing yesterday's date, but in a different format: 29-Jul-2007 (so I have to figure out how to put hyphens between %d, %b, and %Y...)
3) Finally, what does "aaa24" mean?
# 13  
Old 07-31-2007
Quote:
Originally Posted by frustrated1
I need to get yesterdays date in the format yyyymmdd
I can get today's date simply enough - 20031112

Is there any way to substract 1 from this easily enough in korn shell script?

It has to be korn shell and not perl
To get the todays date
Code:
echo $(date "+%G%m%d")

Yesterday date
Code:
echo $(date -d "1 day ago" "+%G%m%d")

# 14  
Old 07-31-2007
Oops, I didnt check that it was a old request Smilie
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